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This paper presents a methodology for voltage sags magnitudes calculation in the presence of alternative energy sources and/or distributed generators. The method determines the degree of influence of the parameters from the new generating units connected to the electrical system with regard to voltage sags magnitudes. The impedance matrix - Zbus is used to obtain analytical expressions that represent...
Voltage sag is one of the common and sensitive issues for customers and power system utilities. When voltage sag occurs at supply end will cause shutdown of the entire industrial operation process, it incurs financial and technical losses to the industries. Among various industrial processes, adjustable speed drives are more commonly used. According to data obtained from experimental tests performed...
In the year 2007, South Africa experienced high demands of electricity power than that could have been generated. Due to greater demand than the generation, the country experienced planned and unplanned load shedding. Hence the commercial operations, industrialization country's economy and mostly people's life styles were highly affected. The unplanned load growth, indiscriminate integration of distributed...
The impact of distributed generation (DG) in a distribution network depends on the design of the protection system and the coordination between the different protective devices. This paper presents the main features of a library of protective devices implemented in an EMTP-type tool for power quality studies in distribution networks with distributed generation. The document discusses the present protection...
According to recent target of the Japanese government, more than 50 GW photovoltaic (PV) power generation will be penetrated in the utility system until 2030. Current measures adopted to DG to keep power quality and safety of the grid may not be adapted any more in the large penetration. In advance of the declaration of the target, CRIEPI proposed the Autonomous Demand Area Power System (ADAPS) as...
This paper propose a method to evaluate the dip and interruption costs in the distribution system with distributed generation units (DGs). The game theory is used to allocate the additional cost caused by operating DGs. To evaluate the impacts of DGs on dip and interruption costs, which could be positive impact or negative impact, the operating hours of DGs, the frequencies of the power quality events...
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